package com.junzhiit.nengji.app.web.util.rsa;

import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.openssl.PEMReader;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;


/**
 * RSA安全编码组件
 */
public abstract class RSACoder extends Coder {
	public static final String KEY_ALGORITHM = "RSA";
	// public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
	public static final String SIGNATURE_ALGORITHM = "SHA1withRSA";

	private static final String PUBLIC_KEY = "RSAPublicKey";
	private static final String PRIVATE_KEY = "RSAPrivateKey";

	private static final String RSA_ECB_PKCS1PADDING = "RSA/ECB/PKCS1Padding";
	private static final String BOUNCY_CASTLE_PROVIDER = "BC";
	
	private static final int KEY_SIZE = 2048;

	/**
	 * 用私钥对信息生成数字签名
	 * 
	 * @param data
	 *            加密数据
	 * @param privateKey
	 *            私钥
	 * 
	 * @return
	 * @throws Exception
	 */
	public static String sign(byte[] data, PrivateKey privateKey) throws Exception {
		// // 解密由base64编码的私钥
		// byte[] keyBytes = decryptBASE64(privateKey);
		//
		// // 构造PKCS8EncodedKeySpec对象
		// PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		//
		// // KEY_ALGORITHM 指定的加密算法
		// KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		//
		// // 取私钥匙对象
		// PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);

		// 用私钥对信息生成数字签名
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initSign(privateKey);
		signature.update(data);

		return encryptBASE64(signature.sign());
	}

	/**
	 * 校验数字签名
	 * 
	 * @param data
	 *            加密数据
	 * @param publicKey
	 *            公钥
	 * @param sign
	 *            数字签名
	 * 
	 * @return 校验成功返回true 失败返回false
	 * @throws Exception
	 * 
	 */
	public static boolean verify(byte[] data, PublicKey publicKey, String sign) throws Exception {

		// // 解密由base64编码的公钥
		// byte[] keyBytes = decryptBASE64(publicKey);
		//
		// // 构造X509EncodedKeySpec对象
		// X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		//
		// // KEY_ALGORITHM 指定的加密算法
		// KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		//
		// // 取公钥匙对象
		// PublicKey pubKey = keyFactory.generatePublic(keySpec);

		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initVerify(publicKey);
		signature.update(data);

		// 验证签名是否正常
		return signature.verify(decryptBASE64(sign));
	}

	/**
	 * 解密<br>
	 * 用私钥解密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decryptByPrivateKey(byte[] data, PrivateKey privateKey) throws Exception {
		// // 对密钥解密
		// byte[] keyBytes = decryptBASE64(key);
		//
		// // 取得私钥
		// PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		// KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

		// 对数据解密
		Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, privateKey);

		data = Base64.decodeBase64(data);

		return cipher.doFinal(data);
	}

	/**
	 * 解密<br>
	 * 用公钥解密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] decryptByPublicKey(byte[] data, PublicKey key) throws Exception {
		// 对密钥解密
		// byte[] keyBytes = decryptBASE64(key);
		//
		// // 取得公钥
		// X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		// KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// Key publicKey = keyFactory.generatePublic(x509KeySpec);

		// 对数据解密
		Cipher cipher = Cipher.getInstance(key.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, key);

		return cipher.doFinal(data);
	}

	/**
	 * 加密<br>
	 * 用公钥加密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] encryptByPublicKey(byte[] data, PublicKey key) throws Exception {
		// 对公钥解密

		// byte[] keyBytes = decryptBASE64(key);

		// 取得公钥 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); 
		// KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); 
		// Key publicKey = keyFactory.generatePublic(x509KeySpec);

		// 对数据加密
		Cipher cipher = Cipher.getInstance(key.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, key);

		return cipher.doFinal(data);
	}

	/**
	 * 加密<br>
	 * 用私钥加密
	 * 
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] encryptByPrivateKey(byte[] data, KeyPair key) throws Exception {
		// // 对密钥解密
		// byte[] keyBytes = decryptBASE64(key);
		//
		// // 取得私钥
		// PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		// KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

		// 对数据加密
		Cipher cipher = Cipher.getInstance(key.getPrivate().getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, key.getPrivate());

		return cipher.doFinal(data);
	}

	public static byte[] encryptByPrivateKey(byte[] data, PrivateKey key) throws Exception {
		// // 对密钥解密
		// byte[] keyBytes = decryptBASE64(key);
		//
		// // 取得私钥
		// PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		// KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

		// 对数据加密
		Cipher cipher = Cipher.getInstance(key.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, key);

		return cipher.doFinal(data);
	}

	/**
	 * 取得私钥
	 * 
	 * @param keyMap
	 * @return
	 * @throws Exception
	 */
	public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
		Key key = (Key) keyMap.get(PRIVATE_KEY);

		return encryptBASE64(key.getEncoded());
	}

	/**
	 * 取得公钥
	 * 
	 * @param keyMap
	 * @return
	 * @throws Exception
	 */
	public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
		Key key = (Key) keyMap.get(PUBLIC_KEY);

		return encryptBASE64(key.getEncoded());
	}

	/**
	 * 初始化密钥
	 * 
	 * @return
	 * @throws Exception
	 */
	public static Map<String, Object> initKey() throws Exception {
		KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
		keyPairGen.initialize(KEY_SIZE);

		KeyPair keyPair = keyPairGen.generateKeyPair();

		// 公钥
		RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

		// 私钥
		RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

		Map<String, Object> keyMap = new HashMap<String, Object>(2);

		keyMap.put(PUBLIC_KEY, publicKey);
		keyMap.put(PRIVATE_KEY, privateKey);
		return keyMap;
	}

	public static String encryptByKey(String content, String privateKeyContent) throws Exception {
		if (content != null && privateKeyContent != null) {
			byte[] b = Base64.encodeBase64(privateKeyContent.getBytes());
			KeyFactory kf = KeyFactory.getInstance("RSA");
			PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(b);
			PrivateKey sKey = kf.generatePrivate(keySpec);

			Cipher cipher = Cipher.getInstance(RSA_ECB_PKCS1PADDING, BOUNCY_CASTLE_PROVIDER);
			byte[] byteContent = content.getBytes("UTF-8");
			cipher.init(Cipher.ENCRYPT_MODE, sKey);
			byte[] result = cipher.doFinal(byteContent);
			byte[] encryptedResult = Base64.encodeBase64(result);
			return new String(encryptedResult);
		} else {
			return null;
		}
	}

	public static String encryptByKey(String content, PrivateKey sKey) throws Exception {
		if (content != null && sKey != null) {

			Cipher cipher = Cipher.getInstance(RSA_ECB_PKCS1PADDING, BOUNCY_CASTLE_PROVIDER);
			byte[] byteContent = content.getBytes("UTF-8");
			cipher.init(Cipher.ENCRYPT_MODE, sKey);
			byte[] result = cipher.doFinal(byteContent);
			byte[] encryptedResult = Base64.encodeBase64(result);
			return new String(encryptedResult);
		} else {
			return null;
		}
	}

	public static String encryptByKey(String content, PublicKey sKey) throws Exception {
		if (content != null && sKey != null) {

			Cipher cipher = Cipher.getInstance(RSA_ECB_PKCS1PADDING, BOUNCY_CASTLE_PROVIDER);
			byte[] byteContent = content.getBytes("UTF-8");
			cipher.init(Cipher.ENCRYPT_MODE, sKey);
			byte[] result = cipher.doFinal(byteContent);
			byte[] encryptedResult = Base64.encodeBase64(result);
			return new String(encryptedResult);
		} else {
			return null;
		}
	}

	public static String decrypt(String content, String publicKeys) throws Exception {

		byte[] keyByte = Base64.decodeBase64(publicKeys.getBytes());
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyByte);
		KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
		PublicKey pKey = mykeyFactory.generatePublic(keySpec);

		Cipher cipher = Cipher.getInstance(RSA_ECB_PKCS1PADDING, BOUNCY_CASTLE_PROVIDER);
		// Cipher cipher = Cipher.getInstance("RSA", "BC");
		cipher.init(Cipher.DECRYPT_MODE, pKey);

		byte[] bcontent = Base64.encodeBase64(content.getBytes());
		byte[] result = cipher.doFinal(bcontent);
		return new String(result);
	}

	public static String decrypt(String content, PublicKey pKey) throws Exception {
		Cipher cipher = Cipher.getInstance(RSA_ECB_PKCS1PADDING, BOUNCY_CASTLE_PROVIDER);
		// Cipher cipher = Cipher.getInstance("RSA", "BC");
		cipher.init(Cipher.DECRYPT_MODE, pKey);

		byte[] bcontent = Base64.decodeBase64(content.getBytes());

		byte[] result = cipher.doFinal(bcontent);
		return new String(result);
	}

	public static String decrypt(String content, PrivateKey privateKey) throws Exception {
		// 对数据解密
		Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, privateKey);

		byte[] result = cipher.doFinal(decryptBASE64(content));
		return new String(result);
	}

	public static void main(String[] args) {

		String message = "aaa";
		System.out.println("message:" + message);
		try {
			
//			PublicKey publicKey = KeyUtil.publicKey("/key/cms/rsa_public_key.pem");
//			String signature = RSACoder.encryptByKey(message, publicKey);
//			System.out.println(signature);
//			KeyPair keyPair = KeyUtil.keyPair("/key/cms/rsa_private_key.pem");
//			System.out.println(RSACoder.decrypt(signature, keyPair.getPrivate()));
			
//			KeyPair keyPair = KeyUtil.keyPair("/key/cms/rsa_private_key.pem");
//			String signature = RSACoder.encryptByKey(message, keyPair.getPrivate());
//			
//			
//			PublicKey publicKey = KeyUtil.publicKey("/key/cms/rsa_public_key.pem");
//			
//			System.out.println(RSACoder.decrypt(signature, publicKey));
			
			
//			Resource publicResource = new ClassPathResource("/key/cms/rsa_public_key.pem"); // public key
//			PEMReader publicPemReader = new PEMReader(new InputStreamReader(publicResource.getInputStream()));
//			PublicKey publicKey = ((PublicKey) publicPemReader.readObject());
//
//			String encryptedMessage = RSACoder.encryptByKey(message, publicKey); // encrypt with public key
//			System.out.println("encryptedMessage:" + encryptedMessage);
//
//			Resource privateResource = new ClassPathResource("/key/cms/rsa_private_key.pem"); // private key
//			PEMReader privatePemReader = new PEMReader(new InputStreamReader(privateResource.getInputStream()));
//			KeyPair keyPair = (KeyPair) privatePemReader.readObject();
//			PrivateKey privateKey = keyPair.getPrivate();
//
//			String decryptMessage = RSACoder.decrypt(encryptedMessage, privateKey); // decrypt with private key
//			System.out.println("decryptMessage:" + decryptMessage);
//
//			System.out.println("result:" + decryptMessage.equals(message));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
}
